测试目标点是否在多边形内int pnpoly(int nvert, float *vertx, float *verty, float testx, float testy) { int i, j, c = 0; for (i = 0, j = nvert-1; i < nvert; j = i++) { if ( ((verty[i]>testy) != (verty[j]>testy)) && (testx < (vertx[j]-vertx[i]) * (te…

https://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html The C Code Here is the code, for reference. Excluding lines with only braces, there are only 7 lines of code. int pnpoly(int nvert, float *vertx, float *verty, float testx, float…

写C语言的实验用到的一个算法,判断一个点是否在多边形的内部.C的代码如下: int pnpoly(int nvert, float *vertx, float *verty, float testx, float testy) { int i, j, c = 0; for (i = 0, j = nvert-1; i < nvert; j = i++) { if ( ((verty[i]>testy) != (verty[j]>testy)) && (testx <…

Determining if a point lies on the interior of a polygon Written by Paul Bourke  November 1987 Solution 1 (2D) The following is a simple solution to the problem often encountered in computer graphics, determining whether or not a point (x,y) lies ins…

SVG & convert polygon/polyline to path SVG Polygon/Polyline to Path Converter https://codepen.io/xgqfrms/pen/VwLpbJq?editors=0010 regex const convertPolygonToPath = (svgStr = ``) => { const result = svgStr // close path for polygon .replace(/(<p…

1.程序宏观结构图…

题意:有很多棍子,从棍子中选出两个棍子集合,使他们的和相等,求能取得的最多棍子数. 解法:容易看出有一个多阶段决策的过程,对于每个棍子,我们有 可以不选,或是选在第一个集合,或是选在第二个集合 这三种决策.因为两个集合最后的和要相等,那么令一个集合为正,另一个为负,那么最后和为0,我们用偏移0的量来作为状态之一. dp[i][j]表示前 i 个 偏移量为 j 的最大棍子数,因为每根棍最长为200,所以偏移量最多为+-20000,所以在+-20000之间枚举,最多100*40000 代码: #in…

1285 - Drawing Simple Polygon   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Given set of points in the plane, your task is to draw a polygon using the points. You have to use all the points. To be more specific, each po…

A General Polygon Clipping Library Version 2.32    http://www.cs.man.ac.uk/~toby/alan/software/gpc.html Alan Murta Advanced Interfaces Group Department of Computer Science University of Manchester Manchester M13 9PL, UK Abstract: This document descri…

Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5472   Accepted: 2334 Description Polygon is a game for one player that starts on a polygon with N vertices, like the one in Figure 1, where N=4. Each vertex is labelled with an integer and…